package com.edu.app.controller.utils.wx;

import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;

import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ConnectException;
import java.net.URL;

public class WxUtils {
    /**
     * 获取接口访问凭证
     *
     * @param appid 凭证
     * @param appsecret 密钥
     * @return
     */
    public static String getAccess_token(String appid, String appsecret) {
        //凭证获取(GET)
        String token_url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=APPID&secret=APPSECRET";
        String requestUrl = token_url.replace("APPID", appid).replace("APPSECRET", appsecret);
        // 发起GET请求获取凭证
        JSONObject jsonObject = httpsRequest(requestUrl, "GET", null);
        String access_token = null;
        if (null != jsonObject) {
            try {
                access_token = jsonObject.getString("access_token");
            } catch (JSONException e) {
                // 获取token失败
                //log.error("获取token失败 errcode:{} errmsg:{}", jsonObject.getInt("errcode"), jsonObject.getString("errmsg"));
            }
        }
        return access_token;
    }

    public static String getAppAccess_token(String appid, String appsecret, String code) {
        //凭证获取(GET)
        String token_url = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=APPSECRET&code=CODE&grant_type=authorization_code";
        String requestUrl = token_url.replace("APPID", appid).replace("APPSECRET", appsecret).replace("CODE", code);
        // 发起GET请求获取凭证
        JSONObject jsonObject = httpsRequest(requestUrl, "GET", null);
        String access_token = null;
        if (null != jsonObject) {
            try {
                access_token = jsonObject.getString("access_token");
            } catch (JSONException e) {
                // 获取token失败
                //log.error("获取token失败 errcode:{} errmsg:{}", jsonObject.getInt("errcode"), jsonObject.getString("errmsg"));
            }
        }
        return access_token;
    }

    public static String getJsApiTicket(String access_token) {
        String url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=ACCESS_TOKEN&type=jsapi";
        String requestUrl = url.replace("ACCESS_TOKEN", access_token);
        // 发起GET请求获取凭证
        JSONObject jsonObject = httpsRequest(requestUrl, "GET", null);
        String ticket = null;
        if (null != jsonObject) {
            try {
                ticket = jsonObject.getString("ticket");
            } catch (JSONException e) {
                // 获取token失败
                //log.error("获取token失败 errcode:{} errmsg:{}", jsonObject.getInt("errcode"), jsonObject.getString("errmsg"));
            }
        }
        return ticket;
    }

    public static JSONObject httpsRequest(String requestUrl, String requestMethod, String outputStr) {
        JSONObject jsonObject = null;
        StringBuffer buffer = new StringBuffer();
        try {
            // 创建SSLContext对象，并使用我们指定的信任管理器初始化
            TrustManager[] tm = { new MyX509TrustManager() };
            SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
            sslContext.init(null, tm, new java.security.SecureRandom());
            // 从上述SSLContext对象中得到SSLSocketFactory对象
            SSLSocketFactory ssf = sslContext.getSocketFactory();

            URL url = new URL(requestUrl);
            HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();
            httpUrlConn.setSSLSocketFactory(ssf);

            httpUrlConn.setDoOutput(true);
            httpUrlConn.setDoInput(true);
            httpUrlConn.setUseCaches(false);
            // 设置请求方式（GET/POST）
            httpUrlConn.setRequestMethod(requestMethod);

            if ("GET".equalsIgnoreCase(requestMethod))
                httpUrlConn.connect();

            // 当有数据需要提交时
            if (null != outputStr) {
                OutputStream outputStream = httpUrlConn.getOutputStream();
                // 注意编码格式，防止中文乱码
                outputStream.write(outputStr.getBytes("UTF-8"));
                outputStream.close();
            }

            // 将返回的输入流转换成字符串
            InputStream inputStream = httpUrlConn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            bufferedReader.close();
            inputStreamReader.close();
            // 释放资源
            inputStream.close();
            inputStream = null;
            httpUrlConn.disconnect();
            jsonObject = JSONObject.parseObject(buffer.toString());
        } catch (ConnectException ce) {
            //log.error("Weixin server connection timed out.");
        } catch (Exception e) {
            //log.error("https request error:{}", e);
        }
        return jsonObject;
    }
}
